In the Income Tax Self Assessment Summary, the allowable expenses box 20 (Car, van and travel) fills with fuel cost instead of mileage allowance. Is this a known issue?

The allowable expenses in Box 20 are designed to encompass all expenses incurred during business trips, shamilt1. This includes mileage expenses like fuel costs. I'll share more information regarding your concern below.

In the context of UK tax returns and expense reporting, particularly for self-employed individuals, the Allowable Expenses section, specifically Box 20 serves a broader purpose in capturing various legitimate business-related travel costs, not just mileage expenses.

This includes, but is not limited to:

• Fuel costs
• Car or van insurance premiums
• Vehicle repairs and servicing
• Parking fees
• Vehicle hire charges
• Vehicle license fees
• Breakdown coverage memberships (e.g., AA or RAC)
• Public transportation fares (train, bus, air, or taxi)
• Accommodation costs for overnight stays
• Meal expenses during business trips

This approach allows for a more accurate representation of the total costs associated with business operations.

Also, you can view this page to have a thorough explanation of the boxes with its allowable and disallowable expenses under the Self Assessment tax return (SA103F) in QBO: Allowable and disallowable expenses explained.

Lastly, you can check this article to learn how to manage Self-assessment tax returns, along with the steps on how to export them in QBO: Self Assessment for Income Tax: Checklist for QuickBooks.

Armed with this knowledge about Box 20, you've gained an advantage in navigating your tax documents, shamilt1. Please revisit this thread if you've further questions with regard to your tax returns in QBO. We're always here to help.